Metallurgical filter.



No. 730,195. I PATBNTED'JUNE 2', 1903., J.&'L.STOVEKEN. METALLURGICAL FILTER.

APPLIOATION FILED 0013.31. 1902.

no MODEL.

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No. 730,195. PATENTED JUNE 2, 1.903; v J. a, L. STOVEKEN.

METALLURGICAL FILTER. APPLICATION PfLED 00'1Q31, 1901. 1 NO MODEL. 3 SHEETSBHBBT III) \' IIIIIIII s. I

No. 730,195. PATENTED JUNE 2, 1903. i

I J. & L. STOVEKEN. I v I METALLURGICAL FILTER.

APPLICATION FILED OUT. 31, 1902. N0 MBDEL.

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' UNITED S rains V Patented June 2, 1903.

PATENT Clarion.-

JOHN- STOVEKEN, OF CRIPPLEOREEK, AND LEO STOVEKEN, OF FLORENCE,

. COLORADO.

M ETALLURGICAL FILTER.

7 forming part of Letters Patent No. 730,195, dated June 2, 1903.

Original application filed August 12, 1902, Serial No. 119,433. Divided and this application filed October 31, 1902- Serial N0.129,618. (No model.)

ment in the apparatus forming the subject.

is matter of our contemporary application filed August 12, 1902, Serial No. 119,433, which apparatus is designed more especially for the treatment of ores in which only a small percentage of values can be saved; by amalga- 2o mation and which ores are of too low grade to be treated by barrel chlorination and too clayey or slimy to be percolated by cyanid solution.

Thepresent application is filed as a division of our contemporary application above mentioned.

With the foregoing in mind the invention will be fully understood from the following description and claims when taken in con- 0 nection' with the accompanying drawings, in

' which-- Figure 1 is a side elevation, partly in section, ofour improved filter. Fig. 2 is a detail plan view'of the spreader forming part of the filter. Figs. 3 and at are enlarged sections taken in the planes indicated by the broken lines 3 3 and 4: 4:, respectively, of Fig. 1. Fig. 5 is a detail horizontal section taken in the plane of the broken line 4 4, of Fig. 4, looking downwardly; and Fig. 6 is abroken view,

partly in elevation and partly in vertical section, illustrating the improved filter in connection with the lowest agitation-tank and the decanting-vat of the apparatus disclosedin our prior application supra. I

Similar letters ofreference designate corresponding parts in all of the several views of the drawings, referring to which- A, Fig. 6, is an agitation-tank. This tank into a plurality of decanting-tanks a is the last and lowest of the series disclosed 5c in our aforesaid prior application and is provided with a discharge-pipe A, which leads from its upper portion and is designed to conduct pulp or mixed comminuted ore and solution to the filter presently described. When desired, the tank A may also be provided with a valved pipe A which leads from its lower portion and is designed to be used when the tank is to be cleaned out.

Bis adecanting-vat, which is similar tothat shown in our aforesaid prior application-11. e., is divided by transverse partition-walls a Each of these tanks is provided at its lower end with a steep funnel a, which is provided-inturn at its lower end with a valved discharge 606, arranged over a trough or receptacle 0. Said tanks are designed to receive solutions from the receptacles of the filter, presently described, and when the solutions are led into them through conduits (not shown) the slimes settle into the funnels a and are drawn off at intervals into the receptacle a while the clear solution passes through one or more conduits a at one end of the vat to agold-tank. (Not shown.)

C isour improved filter, which is preferably arranged between the tank-A and the vat B, as shown. The said filter isbest shown in Figs. 1 to 5, referring to which 1' is the main frame of the filter, which preferably comprises a base and two longitudinal uprights and is provided at the upper sides of the latter withparallel longitudinal ways m,

Figs. 2 to 4; n n, transverse shafts journaled in the uprights of the frame at the ends thereof and equipped with sprocket-wheels 1), arranged in alinement with the ways m; r r, sprocket-chains mounted on the wheelsp and having their upper stretches disposed inthe ways m; s, an endless filter-plgthgt if, end- 'n less strips of rubber or other suitable material, secured to the inner side of the cloth 8 at the edges thereof and having for their purpose to bear on the upper edges of the longitudinal frame-uprights, and thereby prevent frictional wear of the cloth; U u, arms connected to the chains 4' at intervals in the length thereof and extending inwardly therefrom; Q) '21, links which connect the filtercloth and rubber belts to the arms a; w w, transverse rolls of wood or othersuitable material mounted in the frame-uprights below the upper stretch of the filter-cloth and arranged by preference in three sets, as best shown in Fig. 1; 50 0c, idler sprocket-wheels disposed above and in engagement with the upper stretches of the chains r and having for their purpose to hold the chains down on sprocket-gears g on the rolls 10, so as to assure the rotation of the rolls in the direction indicated by arrow by the chains; 2 e, transverse rolls arranged in three sets above the rolls to and the upper stretch of the filtercloth 8 and designed to be pressed by screws (1 or other means toward the filter-cloth; b 1), rolls, one of which is employed in conjunction with each set of rolls 2; c 0, screws, the purpose of which is to hold the upper bearing-blocks of the rolls b on the lower slidable bearing-blocks thereof; cl cl, screws for adjusting the bearings of the rolls 1) in the direction of the length of the filter and adjustably fixing the same in position; 6 e, belts, of rubber or other suitable material, passed around the rolls ,2 and b and having their lower stretches arranged in frictional contact with the filter-cloth s; ff, receptacles arranged under the three sets of rolls to and designed to be connected by pipes g with the separate decanting-tanks a of the vat B; h h, pipes designed to be connected with a source of water-supply and arranged to spray water against the stretches of the rubber belts e between the filter-cloth s and the rolls b; t" t", pipes arranged to spray water against the lower stretch of the filtercloth s; j, a rotary beater arranged adjacent to the pipes 1i and adapted to engage the lower stretch of the cloth 8; 7s, a transverse roller arranged above the lower stretch of the cloth 5 and adjacent to the beater and having its ends journaled in disks 1 off the center thereof, the disks being arranged in straps m and provided with handles 71; p, a transverse roll arranged be low the lower stretch of the cloth 8; g, a weighted transverse roll arranged above the lower stretch of the cloth 8 and having for its purpose to squeeze the same against the roll 13, and r a rotatable spreader arranged above the upper stretch of the cloth 8 at the receiving end of the filter. One of the shafts n of the filter is designed to be driven by a suitable motor, (not shown,) while the beaterj is preferably driven from an overhead countershaft. (Also not shown.) The spreader r is arranged in a box r which preferably has an apron r overhanging the belt 8. The

spreader is a six-sided shaft having wooden flights or wings r on its sides, the wings at one side of the center of the shaft being inclined oppositely to those at the opposite side of the center. belt from an overhead ,counter-shaft. shown.)

The spreader is driven by a (Not The operation of the filter C in detail is as follows: The chains 7' and filter-cloth s are driven in the direction indicated by arrow and the beaterj and spreader r are rotated. The rubber belts e are driven in the direction indicated by arrow by the friction between them and the filtencloth. The pulp and solution are discharged from the last agitation tank A through pipe A into the spreader, which has flights extending right and left from the center, and is consequently adapted to keep the pulp and solution mixed and spread the same uniformly across the filtercloth. The filtercloth carries the mixed rolls a, where the first rubber belt e presses the solution through the filter-cloth. This solution, which is strong, is received in the first receptacle f and is carried by the pipe g to one of the decanting-tanks of the vat B. As it leaves the first set of press-rolls most of the pulp adheres to the first belt 6. It is, however, washed down to the cloth by the spray of water from the adjacent pipe 72', which also dilutes the values left as moisture in the pulp. The mixed pulp and water then pass under the second set of press-rolls egwhere the second belt 6 passes the solution, which is of medium strength, through the filterpulpand solution under the first set of press-v cloth. This solution is received in the sec- 0nd receptacle f and conducted by the pipe 9' thereof to a tank of the vat 13, separate from that in which the first solution is placed. In leaving the second set of press-rolls the pulp is watered by the pipes h adjacent to the second belt 2, and the pulp and water are carried below the third set of pressrolls. Here the weak solution produced by the mixture of pulp and water is pressed through the cloth 5 and received in the third receptaelef, from whence it is conducted by the pipe 9, complementary to said receptacle, to a separate tank of the vat B. After leaving the third set of press-rolls the pulp is forced from the cloth by the water discharged by the pipes z" and the beater j and is discharged as tailings from the filter through a launder a which may extend to a dump or any other point. After being acted on by the beaterj' the cloth 8 passes between the squeeze-rollsp q,which serve to press the water from the cloth, with the result that the same returns to the receiving end of the filter in a clean and dry state. By turning the disks Z, and thereby raising or lowering the roller 70, the filter-cloth is carried toward or from the beaterj to increase or diminish the action of the beater on the cloth.

It will be readily appreciated from the foregoing that the construction of our improved filter is such that the slimes are effectually prevented from collecting and packing down on the filter-cloth and preventing the passage of the solutions therethrough; also, that by virtue of the chains traveling in ways or grooves in the frame and being connected to the filter-cloth the filter-cloth is spread out and'always held in proper positionwith respect to the press-rolls. and belts e, which conduces to the thorough separationof the solution from the pulp.

We prefer in practice to use a pump M Fig. 6, and conduits'M to return the slimes discharged from the tanks at of vat B to either the tank A, as shown, or to'the filter, as de-- sired, this in order to pass the slimes through the filter the second time and recover the solution contained therein.

We have entered into a detailed description of the construction and relative arrangement of the parts embraced in the present and preferred embodiment of our invention in order to impart a full, clear, and exact 1111-- derstanding of the same. We do not desire, however, to be understood as-confining ourselves to such specific construction andrelative arrangement of parts, as'su'ch changes or modifications may be made in practice as fairly fall within the scope of our inventionas claimed.

belts, and means for pressing pulp against the upper stretch of the filter-cloth.

2. A filter comprising a frame having parallel ways at its upper side, belts having their upper stretches disposed in s'aid'ways, means for driving the belts, an endless filter-cloth I interposed between and connected with the belts, endless stripsof rubber or other suitable material connected to the inner side of they filter-cloth at the edges thereof so that their upper stretches will bear onthe frame, and means for pressing pulp against the upper stretch of the filter-cloth.

3. A filter comprising a frame, having parallel ways at its upper side, belts having their upper stretches disposed in said ways, means for driving the belts, an endless filter-cloth interposed between and connected with the belts, rolls mounted in the frame and disposed below the upper stretches of the belts and 'filter-cloth, idlers for holding the upper stretches of the belts down in engagement with the rolls, rolls arranged above and adjacent to the upper stretch of the filter-cloth,

an upper roll, a belt passed around said rolls above and adjacent to the'filter-cloth and the upper roll, and means for supplying water to said belt.

4. A filter comprising a frame, an endless filter-cloth supported and adapted to bedriven in' the frame, means for forcing solution through the upper stretch of the filter-cloth,

means for washing thelower stretch 'of the filter-cloth, meansfor beating the same, and means for squeezing moisture from said stretch of the cloth.

5; A filtercomp'rising a frame, an endless filter-clot-h supported andad apted tobe driven in the frame, rolls-arranged above andadjacent to the upper stretch of the filter-cloth,

an upper roll,'abeltpassedaround said rolls above -and adjacent to the filter-cloth and the upper'roll, means for supplying water to said belt, means for washing the lower stretch of the filter-cloth, means for beating the'same, and means-for squeezing moisture from said stretch of the cloth.

6. A filter comprising a frame having parallel ways at its upper side,'sprocket-wheels mounted at the ends of "the frame, and in 'alinement with the ways,'.. sprocket 7 belts passed around said wheels, and having their upper stretches disposed in the ways, an endless filter-cloth interposed between and connected with the sprocket-belts, rolls arranged below. the upper stretch'of the filter-cloth,

and geared with the upper stretches of the sprocket-belts, rolls arranged above and adjacent to the upper stretch of the filter-cloth, an upper roll, a belt of rubber or other suitable material passed around said rolls above and adjacent to the filter-cloth,-and the upper--roll,and means for supplying water to said rubber belt.

7. A filter comprising a frame having par-- allel-ways at its upperrside, sprocket-wheels mounted at the ends of the frame, and inalinement' with the ways, sprocket-belts passed around said wheels, and having their upper stretches disposed in the ways, an endless filter-cloth interposed between and connected with thesprocket-belts, sets of rolls'arranged below the upper stretch of the filter-cloth, and geared with the upper stretches of'the sprocket-belts, sets of 'rolls arranged aboveand'adja cent to the upper stretch of the-filter-cloth, upper rolls complementary to-the rolls above and adjacent-to the-upper stretchof the cloth, belts of rubber or other suitablematerial passed around the rolls aboveand adjacent to the upper stretch of the cloth,

and the upper rolls complementary thereto,"

means-for supplying'wat'er to said rubber belts, and separate receptacles arrangedbelow the sets of rolls. a

IIO

8. In an apparatus for extracting precious metals from their ores, the combination of a: filter comprising a frame, an endless filterclo-th,means for driving same,meansfor pressing pulp against the upper stretch of the cloth at different points, and separate receptacles arranged below the cloth at such points, anda decanting-vat having separate tanks connected with the said separate receptacles of the filter; the said separate tanks com'muni-* eating with the vat at their upper ends, and

having valved discharges at their lower ends. 9; In an apparatus for extracting precious metals from their ores, the combination of a filter comprising a frame, an endless filtercloth, means for driving the same, means for pressing pulp against the upper stretch of the cloth at different points, and separate receptacles arranged below the cloth at such points, In testimony whereof we have hereunto set and separate decanting-tanks connected with our hands in presence of two subscribing Witthe said separate receptacles of the filter. messes.

10. An apparatus for extracting precious 5 metals from their ores comprising a filter, a JOHN STOVEKEN. decanting-tank arranged to receive solution LEO STOVEKEN. from the filter, and means for returning the sliines from the tank to the filter for the pur- Witnesses: pose of recovering the solution contained in JOSEPH STOVEKEN,

lo the slimes. 1 ELLA FRANCES LU'rEs. 

